JEE Main 2019 (Online) 12th April Evening Slot

Paper was held on
Fri, Apr 12, 2019 9:30 AM

## Chemistry

Among the following, the INCORRECT statement about colloids is :

View Question In the following skew conformation of ethane, H'–C–C–H'' dihedral angle is :

View Question An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options :
Assertion (A) : Vi

View Question The IUPAC name for the following compound is :

View Question The C–C bond length is maximum in :

View Question What will be the major product when m-cresol is reacted with propargyl bromide (HC$$ \equiv $$C–CH2Br) in
presence of K2

View Question The decreasing order of electrical conductivity of the following aqueous solutions is :
0.1 M Formic acid (A),
0.1 M Ace

View Question Among the following, the energy of 2s orbital is lowest in :

View Question The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively, are :
(en = ethane-1, 2-diamin

View Question 25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown
hydrocarbon contains :

View Question Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and gaseous product.
MnO2 reacts with Na

View Question The INCORRECT match in the following is :

View Question The primary pollutant that leads to photochemical smog is :

View Question The INCORRECT statement is :

View Question The correct statement is :

View Question The pair that has similar atomic radii is :

View Question NO2 required for a reaction is produced by the decomposition of N2O5 in CCl4 as per the equation,
2N2O5(g) $$ \to $$ 4NO

View Question Which of the given statements is INCORRECT about glycogen?

View Question The correct name of the following polymer is :

View Question A solution is prepared by dissolving 0.6 g of urea (molar mass = 60 g mol–1) and 1.8 g of glucose (molar
mass = 180 g mo

View Question Heating of 2-chloro-1-phenylbutane with EtOK/EtOH gives X as the major product. Reaction of X with
Hg(OAc)2/H2O followed

View Question Consider the following reactions :
'A' is :

View Question The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic
structure are, respe

View Question In comparison to boron, berylium has :

View Question The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to
compound Y. X and Y, re

View Question The compound used in the treatment of lead poisoning is :

View Question In which one of the following equilibria, Kp $$ \ne $$ KC ?

View Question The molar solubility of Cd(OH)2 is 1.84 × 10–5
M in water. The expected solubility of Cd(OH)2 in a buffer
solution of p

View Question Which one of the following is likely to give a precipitate with AgNO3 solution ?

View Question Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

View Question ## Mathematics

Let $$a \in \left( {0,{\pi \over 2}} \right)$$ be fixed. If the integral
$$\int {{{\tan x + \tan \alpha } \over {\tan x

View Question The general solution of the differential equation (y2
– x3)dx – xydy = 0 (x $$ \ne $$ 0) is :
(where c is a constant of

View Question The equation of common tangent to the curves y2
= 16x and xy = –4, is :

View Question A plane which bisects the angle between the two given planes 2x – y + 2z – 4 = 0 and x + 2y + 2z – 2 = 0,
passes through

View Question A triangle has a vertex at (1, 2) and the mid points of the two sides through it are (–1, 1) and (2, 3). Then the centro

View Question The Boolean expression ~(p $$ \Rightarrow $$ (~q)) is equivalent to :

View Question If the area (in sq. units) bounded by the parabola y2
= 4$$\lambda $$x and the line y = $$\lambda $$x, $$\lambda $$ >

View Question Let A, B and C be sets such that $$\phi $$ $$ \ne $$ A $$ \cap $$ B $$ \subseteq $$ C. Then which of the following stat

View Question If $$\alpha $$, $$\beta $$ and $$\gamma $$ are three consecutive terms of a non-constant G.P. such that the equations $$

View Question If 20C1 + (22) 20C2 + (32) 20C3 + ..... + (202
)
20C20 = A(2$$\beta $$), then the ordered pair (A, $$\beta $$) is equal

View Question The length of the perpendicular drawn from the point (2, 1, 4) to the plane containing the lines
$$\overrightarrow r =

View Question A person throws two fair dice. He wins Rs. 15 for throwing a doublet (same numbers on the two dice), wins
Rs. 12 when th

View Question A circle touching the x-axis at (3, 0) and making an intercept of length 8 on the y-axis passes through the
point :

View Question Let $$\alpha $$ $$ \in $$ R and the three vectors $$\overrightarrow a = \alpha \widehat i + \widehat j + 3\widehat k$$,

View Question If [x] denotes the greatest integer $$ \le $$ x, then the system of linear equations [sin $$\theta $$]x + [–cos$$\theta

View Question The tangents to the curve y = (x – 2)2 – 1 at its points of intersection with the line x – y = 3, intersect at the point

View Question A group of students comprises of 5 boys and n girls. If the number of ways, in which a team of 3 students can
randomly b

View Question An ellipse, with foci at (0, 2) and (0, –2) and minor axis of length 4, passes through which of the following points?

View Question For an initial screening of an admission test, a candidate is given fifty problems to solve. If the probability
that the

View Question A straight line L at a distance of 4 units from the origin makes positive intercepts on the coordinate axes and
the perp

View Question A value of $$\alpha $$ such that
$$\int\limits_\alpha ^{\alpha + 1} {{{dx} \over {\left( {x + \alpha } \right)\left( {x

View Question $$\mathop {\lim }\limits_{x \to 0} {{x + 2\sin x} \over {\sqrt {{x^2} + 2\sin x + 1} - \sqrt {{{\sin }^2}x - x + 1} }}$

View Question The derivative of $${\tan ^{ - 1}}\left( {{{\sin x - \cos x} \over {\sin x + \cos x}}} \right)$$, with respect to $${x \

View Question Let S be the set of all $$\alpha $$ $$ \in $$ R such that the equation, cos2x + $$\alpha $$sinx = 2$$\alpha $$– 7 has a

View Question The angle of elevation of the top of a vertical tower standing on a horizontal plane is observed to be 45o from
a point

View Question A value of $$\theta \in \left( {0,{\pi \over 3}} \right)$$, for which
$$\left| {\matrix{
{1 + {{\cos }^2}\theta } &

View Question Let z $$ \in $$ C with Im(z) = 10 and it satisfies $${{2z - n} \over {2z + n}}$$ = 2i - 1 for some natural number n. The

View Question Let f(x) = 5 – |x – 2| and g(x) = |x + 1|, x $$ \in $$ R. If f(x) attains maximum value at $$\alpha $$ and g(x) attains

View Question If a1, a2, a3, ..... are in A.P. such that a1 + a7 + a16 = 40, then the sum of the first 15 terms of this A.P. is :

View Question The term independent of x in the expansion of
$$\left( {{1 \over {60}} - {{{x^8}} \over {81}}} \right).{\left( {2{x^2} -

View Question ## Physics

In the given circuit, the charge on 4 $$\mu $$F capacitor will be :

View Question A particle is moving with speed v = b$$\sqrt x $$ along positive x-axis. Calculate the speed of the particle at
time t =

View Question A transparent cube of side, made of a material of refractive index $$\mu $$2, is immersed in a liquid of refractive
inde

View Question A Carnot engine has an efficiency of $${1 \over 6}$$. When the temperature of the sink is reduced by 62ºC, its efficienc

View Question Consider an electron in a hydrogen atom revolving in its second excited state (having radius 4.65 $$\mathop A\limits^o $

View Question Consider the LR circuit shown in the figure. If the switch S is closed at t = 0 then the amount of charge that
passes th

View Question Let a total charge 2Q be distributed in a sphere of radius R, with the charge density given by $$\rho $$(r) = kr, where

View Question A system of three polarizers P1, P2, P3 is set up such that the pass axis of P3 is crossed with respect to that of P1.
T

View Question A smooth wire of length 2$$\pi $$r is bent into a circle and kept in a vertical plane. A bead can slide smoothly on
the

View Question In an amplitude modulator circuit, the carrier wave is given by, C(t) = 4 sin(20000 $$\pi $$t) while modulating signal
i

View Question A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be
the heat energy

View Question A plane electromagnetic wave having a frequency v = 23.9 GHz propagates along the positive z-direction in
free space. Th

View Question The electron in a hydrogen atom first jumps from the third excited state to the second excited state and
subsequently to

View Question One kg of water, at 20oC, heated in an electric kettle whose heating element has a mean (temperature
averaged) resistanc

View Question A block of mass 5 kg is (i) pushed in case (A) and (ii) pulled in case (B), by a force F = 20 N, making an
angle of 30o

View Question A solid sphere, of radius R acquires a terminal velocity v1 when falling (due to gravity) through a viscous
fluid having

View Question A moving coil galvanometer, having a resistance G, produces full scale deflection when a current Ig flows
through it. Th

View Question Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from
source S1 towards

View Question Half lives of two radioactive nuclei A and B are 10 minutes and 20 minutes, respectively, If initially a sample
has equa

View Question A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air
by resonance tube met

View Question A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB
intensity sound ?

View Question The number density of molecules of a gas depends on their distance r from the origin as, $$n\left( r \right) = {n_0}{e^{

View Question An electron, moving along the x-axis with an initial energy of 100 eV, enters a region of magnetic field $$\overrightarr

View Question A uniform cylindrical rod of length L and radius r, is made from a material whose Young’s modulus of
Elasticity equals Y

View Question Find the magnetic field at point P due to a straight line segment AB of length 6 cm carrying a current of 5A.
(See figur

View Question A spring whose unstretched length is l has a force constant k. The spring is cut into two pieces of unstretched
lengths

View Question The ratio of the weights of a body on the Earth’s surface to that on the surface of a planets is 9 : 4. The mass
of the

View Question Three particles of masses 50 g, 100 g and 150 g are placed at the vertices of an equilateral triangle of side
1 m (as sh

View Question Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the
unregulated input volt

View Question Two particles are projected from the same point with the same speed u such that they have the same range R,
but differen

View Question